How to try oud before buying a full bottle

Two perfumes labelled "oud" can smell nothing alike, and a full bottle isn't cheap. So try before you buy, and do it properly.

The short version

• Decide on skin, not paper: skin is warmer and holds on to some molecules, so perfume smells different there.
• Give it time: the lightest molecules leave first, so smell again after about an hour and later that day.
• Test two at a time and take fresh-air breaks: your nose stops noticing a smell after a while.

Why oud is worth testing first

"Oud" covers a lot of ground

Oud comes from agarwood, the dark resin that forms inside Aquilaria trees. A review of its hundreds of compounds found the mix differs a lot between tree species and growing areas. A 2025 study of oils from six areas agreed: the trees' genes and surroundings both shifted the balance.

Natural agarwood is also scarce. Wild trees have been heavily overharvested, and Aquilaria species are under international trade controls (CITES). Good agarwood is among the most expensive natural materials.

So "oud" on a label tells you the theme, not the smell.

It changes as it wears

A perfume's many molecules all start evaporating at once. The small, light ones escape fastest: these top notes reach your nose first and are gone soonest.

Heavier molecules hold on more tightly and evaporate slowly, forming the heart and base. Plot how much of each is left over time and you get an evaporation profile.

So what you smell in the first few minutes isn't what you'll smell an hour later. A sharp opening can settle into something you love, or the other way round.

Your skin and your nose are your own

Skin isn't a neutral surface. Proteins and fats in its outer layer hold on to some perfume molecules, and a little soaks in. In lab tests, most molecules left skin more slowly than they left glass.

Skin also varies between people:

• Warmth speeds up evaporation, so scent leaves warmer skin faster.
• Dry skin loses scent sooner. In a 2025 study of ten volunteers, the heavier molecules left drier skin faster.
• Skin bacteria and pH often get the blame, but the evidence is thinner. An early study found clean, dry skin barely changed perfume chemically, though bacteria seemed to alter some ingredients in the underarm. In the 2025 study, pH didn't stand out.

Noses differ too. We each carry slightly different smell-receptor genes. A change in just one can make a smell seem weaker or stronger, nicer or nastier.

The best-known case is a molecule called androstenone. Some find it sweaty, others sweet and floral, and some can't smell it at all, partly down to genes. So a friend's verdict is about their nose, not yours.

Your nose adjusts too. Smell one scent for a while and you stop noticing it, though others still can. This is olfactory adaptation.

Nerve cells in your nose turn down their response to a steady smell, and your brain turns it down further. That frees you to notice anything new. Sensitivity comes back after time away from the smell.

Cross-adaptation adds to this: getting used to one smell can dull your response to a similar one, in chemistry or character. It doesn't happen with every pair, but it's one reason a run of similar ouds starts to blur.

Ways to try oud before buying

Testers in a shop

Paper strips, or blotters, let you try several scents in a few minutes. Write the name on each one.

But paper is cooler than skin and lacks skin's proteins and fats, so perfume can smell different on it. Use strips to rule things out: shortlist on paper, then wear one or two out of the shop.

Samples and decants

Some brands sell small samples of their own perfumes. Decants are different: a third party splits a full bottle into small vials to sell on.

Decants are a cheap way to try expensive perfume, but you're trusting the seller. A lawyer and a beauty-industry report both name contamination and fakes as the main risks.

Small sizes and discovery sets

Plenty of brands sell minis, travel sprays or roll-ons, and discovery sets of several scents in small bottles. A set lets you compare a few ouds over the same week.

Match the format

What a perfume is carried in changes how fast it leaves the skin. A spray's alcohol evaporates quickly, carrying the scent into the air around you. An oil has no alcohol, so it stays closer to you.

So if you can, test the format you mean to buy.

How to test an oud properly

1. Shortlist on paper, then test on bare skin, free of perfume and scented lotion.
2. Try two at a time. The Perfume Society suggests one on each wrist and never more than three at once, or your senses get confused.
3. Don't decide in the first few minutes: that's just the top notes.
4. Smell it again after an hour or so, then later in the day. The Perfume Society reckons an hour gives you a proper sense of it.
5. Give your nose fresh-air breaks. Don't count on coffee beans. In one small study, they did no better than plain air or lemon at helping people pick out a new perfume.
6. Before deciding, wear your favourite for a full day to see its whole evaporation profile on your skin. Try another day too if you can: perfume tends to seem stronger in hot weather.

What to write down

Short notes stop the scents blurring into one:

• The name, where you put it and when.
• Your first impression, in your own words.
• How it smells after an hour and later, and what changed.
• Would you wear it again? Would you get through a full bottle?

To choose by a scent's overall character rather than its notes, see our guide to getting started.

Buying samples or decants online

• Buy from the brand or a stockist it names where you can. Which? advises this after finding 23 of the 34 make-up and skincare products it bought on online marketplaces were likely fakes. Perfume wasn't in that test, but the same logic applies.
• Check whether the seller is a business. Buying online from one, you normally have 14 days from delivery to change your mind. From a private seller, the goods only have to be as described.
• Sealed goods that can't be returned for health or hygiene reasons lose that 14-day right once unsealed. Read the returns policy before you open anything.
• Be wary of unlabelled vials. With a decant, you can't see the original bottle, or how it was stored and poured.

Sources

1. Gao M. et al. (2019) "Overview of sesquiterpenes and chromones of agarwood originating from four main species of the genus Aquilaria". RSC Advances 9(8):4113-4130. pmc.ncbi.nlm.nih.gov/articles/PMC9060603
2. Zhang W. et al. (2025) "Dynamic environmental interactions shape the volatile compounds of agarwood oils extracted from Aquilaria sinensis using supercritical carbon dioxide". Molecules 30(4):945. doi.org/10.3390/molecules30040945
3. Baig A., Akram A., Lin M.K. (2025) "Agarwood in the modern era: integrating biotechnology and pharmacology for sustainable use". International Journal of Molecular Sciences 26(17):8468. doi.org/10.3390/ijms26178468
4. The Perfume Society, "Oudh" (ingredient guide). perfumesociety.org
5. Rodrigues A.E. et al. (2021) "Perfume and flavor engineering: a chemical engineering perspective". Molecules 26(11):3095. doi.org/10.3390/molecules26113095
6. Department of Chemistry, Hong Kong Baptist University, "Chemistry in daily life: perfume". chem.hkbu.edu.hk
7. Hadjiefstathiou E. et al. (2025) "Exploring the impact of fragrance molecular and skin properties on the evaporation profile of fragrances". International Journal of Cosmetic Science 47(6):981-995. doi.org/10.1111/ics.13085
8. The Perfume Society, "How to find SIX perfect scents to suit you". perfumesociety.org
9. Behan J.M. et al. (1996) "Insight into how skin changes perfume". International Journal of Cosmetic Science 18(5):237-246. doi.org/10.1111/j.1467-2494.1996.tb00154.x
10. Saiyasombati P., Kasting G.B. (2003) "Two-stage kinetic analysis of fragrance evaporation and absorption from skin". International Journal of Cosmetic Science 25(5):235-243. doi.org/10.1046/j.1467-2494.2003.00193.x
11. Schwarzenbach R., Bertschi L. (2001) "Models to assess perfume diffusion from skin". International Journal of Cosmetic Science 23(2):85-98. doi.org/10.1046/j.1467-2494.2001.00067.x
12. The Perfume Society, "FAQs". perfumesociety.org
13. Keller A. et al. (2007) "Genetic variation in a human odorant receptor alters odour perception". Nature 449:468-472. doi.org/10.1038/nature06162
14. Trimmer C. et al. (2019) "Genetic variation across the human olfactory receptor repertoire alters odor perception". PNAS 116(19):9475-9480. doi.org/10.1073/pnas.1804106115
15. Wysocki C.J., Beauchamp G.K. (1984) "Ability to smell androstenone is genetically determined". PNAS 81(15):4899-4902. doi.org/10.1073/pnas.81.15.4899
16. Dalton P. (2000) "Psychophysical and behavioral characteristics of olfactory adaptation". Chemical Senses 25(4):487-492. doi.org/10.1093/chemse/25.4.487
17. Zufall F., Leinders-Zufall T. (2000) "The cellular and molecular basis of odor adaptation". Chemical Senses 25(4):473-481. doi.org/10.1093/chemse/25.4.473
18. Pellegrino R. et al. (2017) "Habituation and adaptation to odors in humans". Physiology & Behavior 177:13-19. doi.org/10.1016/j.physbeh.2017.04.006
19. Pierce J.D. et al. (1995) "Cross-adaptation of sweaty-smelling 3-methyl-2-hexenoic acid by a structurally-similar, pleasant-smelling odorant". Chemical Senses 20(4):401-411. doi.org/10.1093/chemse/20.4.401
20. O'Connell R.J., Stevens D.A., Zogby L.M. (1994) "Individual differences in the perceived intensity and quality of specific odors following self- and cross-adaptation". Chemical Senses 19(3):197-208. doi.org/10.1093/chemse/19.3.197
21. Brown R. (9 June 2025) on fragrance decanting sites and what brands think of them. Beauty Independent. beautyindependent.com
22. Nelson C. (2025) "Bottled trade mark trouble? The legal uncertainty of decants". Foot Anstey. footanstey.com
23. Vuilleumier C., Flament I., Sauvegrain P. (1995) "Headspace analysis study of evaporation rate of perfume ingredients applied onto skin". International Journal of Cosmetic Science 17(2):61-76. doi.org/10.1111/j.1467-2494.1995.tb00110.x
24. The Perfume Society, "The scented ritual of perfume oils and attars". perfumesociety.org
25. Grosofsky A., Haupert M.L., Versteeg S.W. (2011) "An exploratory investigation of coffee and lemon scents and odor identification". Perceptual and Motor Skills 112(2):536-538. doi.org/10.2466/24.pms.112.2.536-538
26. Aultman C. et al. (15 March 2019) "Should you smell coffee beans while smelling fragrances?". Psychological Science blog, Gustavus Adolphus College. psychologicalscience.blog.gustavus.edu
27. Which? (24 July 2025) "At least two thirds of cosmetics we bought from online marketplaces are likely counterfeits". which.co.uk
28. British Independent Retailers Association (24 July 2025) "Bira welcomes Which? investigation exposing counterfeit cosmetics risk". bira.co.uk
29. GOV.UK, "Accepting returns and giving refunds". gov.uk
30. Department for the Economy (Northern Ireland) Trading Standards Service (11 December 2019) "Know your rights and take care when buying online". economy-ni.gov.uk
31. Citizens Advice (22 November 2018) "Citizens Advice warns buyers need to beware as thousands of people report being ripped off on online marketplaces". citizensadvice.org.uk
32. The Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013, regulation 28. legislation.gov.uk